Frame rate refers to the number of frames or images that are displayed per second in a video. It is measured in frames per second (fps) and affects the smoothness, clarity, and overall quality of the visual content. A higher frame rate results in smoother motion and more realistic visuals while a lower frame rate may cause stuttering or jerky movements in the video. The standard frame rates for film and television are 24fps (frames per second) and 30fps respectively, but high-definition videos often use higher frame rates of 60fps or more to improve image quality.